Brave New World by Aldous Huxley

The novel opens in London in 632 (AD 2540 in the Gregorian Calendar). The vast majority of the population is unified under the World State, an eternally peaceful, stable global society in which goods and resources are plentiful (because the population is permanently limited to no more than two billion people) and everyone is happy. Natural reproduction has been done away with and children are created, 'decanted' and raised in Hatcheries and Conditioning Centres, where they are divided into five castes (which are further split into 'Plus' and 'Minus' members) and designed to fulfill predetermined positions within the social and economic strata of the World State.